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From Benjamin Jaton <benjamin.ja...@gmail.com>
Subject Re: Curator never goes through when ZK is read-only
Date Tue, 12 Jul 2016 21:54:57 GMT
Yes, I mean the ping goes through properly

On Tue, Jul 12, 2016 at 2:50 PM, Cameron McKenzie <mckenzie.cam@gmail.com>
wrote:

> Are the 'dead' hosts reachable? I seem to recall having problems with the
> ZK client blocking for a long time if you had a host configured that was
> resolvable but not reachable.
>
> On Wed, Jul 13, 2016 at 4:30 AM, Benjamin Jaton <benjamin.jaton@gmail.com>
> wrote:
>
>> More to the story:
>>
>> While it consistently works on the same machine than the sole running ZK
>> node when I specify only 2 of the 3 servers in the connection string,
>> it doesn't work when I specify 3 hosts:
>>
>>
>> 2016-07-12 11:23:46 INFO  o.a.z.ZooKeeper:716 - Initiating client
>> connection, connectString=QA-E8WIN11:2181,QA-E8WIN12:2181,QA-E8WIN13:2181
>> sessionTimeout=45000 watcher=org.apache.curator.ConnectionState@c86b9e3
>> 2016-07-12 11:23:46 INFO  o.a.z.ClientCnxn:1138 - Opening socket
>> connection to server QA-E8WIN13/10.11.8.230:2181. Will not attempt to
>> authenticate using SASL (unknown error)
>> 2016-07-12 11:24:01 INFO  o.a.z.ClientCnxn:1251 - Client session timed
>> out, have not heard from server in 15018ms for sessionid 0x0, closing
>> socket connection and attempting reconnect
>> Successfully established the connection with ZooKeeper
>> 2016-07-12 11:24:01 INFO  o.a.z.ClientCnxn:1138 - Opening socket
>> connection to server QA-E8WIN12/10.11.8.232:2181. Will not attempt to
>> authenticate using SASL (unknown error)
>> 2016-07-12 11:24:16 INFO  o.a.z.ClientCnxn:1251 - Client session timed
>> out, have not heard from server in 15000ms for sessionid 0x0, closing
>> socket connection and attempting reconnect
>> 2016-07-12 11:24:16 INFO  o.a.z.ClientCnxn:1138 - Opening socket
>> connection to server QA-E8WIN11/10.11.8.236:2181. Will not attempt to
>> authenticate using SASL (unknown error)
>> 2016-07-12 11:24:16 INFO  o.a.z.ClientCnxn:980 - Socket connection
>> established, initiating session, client: /10.11.8.236:50423, server:
>> QA-E8WIN11/10.11.8.236:2181
>> 2016-07-12 11:24:16 INFO  o.a.z.ClientCnxn:1400 - Session establishment
>> complete on server QA-E8WIN11/10.11.8.236:2181, sessionid =
>> 0x10003c8af64001b, negotiated timeout = 45000 (READ-ONLY mode)
>> 2016-07-12 11:24:16 INFO  o.a.z.ClientCnxn:1297 - Checking server
>> QA-E8WIN13/10.11.8.230:2181 for being r/w. Timeout 200
>> 2016-07-12 11:24:16 INFO  o.a.c.f.s.ConnectionStateManager:228 - State
>> change: READ_ONLY
>> 2016-07-12 11:24:37 INFO  o.a.z.ClientCnxn:1297 - Checking server
>> QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 400
>> 2016-07-12 11:24:58 INFO  o.a.z.ClientCnxn:1251 - Client session timed
>> out, have not heard from server in 42023ms for sessionid 0x10003c8af64001b,
>> closing socket connection and attempting reconnect
>> 2016-07-12 11:24:58 INFO  o.a.c.f.s.ConnectionStateManager:228 - State
>> change: SUSPENDED
>> 2016-07-12 11:25:00 INFO  o.a.z.ClientCnxn:1138 - Opening socket
>> connection to server QA-E8WIN11/10.11.8.236:2181. Will not attempt to
>> authenticate using SASL (unknown error)
>> 2016-07-12 11:25:00 INFO  o.a.z.ClientCnxn:980 - Socket connection
>> established, initiating session, client: /10.11.8.236:50428, server:
>> QA-E8WIN11/10.11.8.236:2181
>> 2016-07-12 11:25:00 INFO  o.a.z.ClientCnxn:1400 - Session establishment
>> complete on server QA-E8WIN11/10.11.8.236:2181, sessionid =
>> 0x10003c8af64001c, negotiated timeout = 45000 (READ-ONLY mode)
>> 2016-07-12 11:25:00 INFO  o.a.z.ClientCnxn:1297 - Checking server
>> QA-E8WIN13/10.11.8.230:2181 for being r/w. Timeout 800
>> 2016-07-12 11:25:00 INFO  o.a.c.f.s.ConnectionStateManager:228 - State
>> change: READ_ONLY
>> 2016-07-12 11:25:21 INFO  o.a.z.ClientCnxn:1297 - Checking server
>> QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 1600
>> 2016-07-12 11:25:42 INFO  o.a.z.ClientCnxn:1251 - Client session timed
>> out, have not heard from server in 42011ms for sessionid 0x10003c8af64001c,
>> closing socket connection and attempting reconnect
>> 2016-07-12 11:25:42 INFO  o.a.c.f.s.ConnectionStateManager:228 - State
>> change: SUSPENDED
>> 2016-07-12 11:25:44 INFO  o.a.z.ClientCnxn:1138 - Opening socket
>> connection to server QA-E8WIN11/10.11.8.236:2181. Will not attempt to
>> authenticate using SASL (unknown error)
>> 2016-07-12 11:25:44 INFO  o.a.z.ClientCnxn:980 - Socket connection
>> established, initiating session, client: /10.11.8.236:50435, server:
>> QA-E8WIN11/10.11.8.236:2181
>> 2016-07-12 11:25:44 INFO  o.a.z.ClientCnxn:1400 - Session establishment
>> complete on server QA-E8WIN11/10.11.8.236:2181, sessionid =
>> 0x10003c8af64001d, negotiated timeout = 45000 (READ-ONLY mode)
>> 2016-07-12 11:25:44 INFO  o.a.z.ClientCnxn:1297 - Checking server
>> QA-E8WIN13/10.11.8.230:2181 for being r/w. Timeout 3200
>> 2016-07-12 11:25:44 INFO  o.a.c.f.s.ConnectionStateManager:228 - State
>> change: READ_ONLY
>> 2016-07-12 11:26:05 INFO  o.a.z.ClientCnxn:1297 - Checking server
>> QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 6400
>> 2016-07-12 11:26:26 INFO  o.a.z.ClientCnxn:1251 - Client session timed
>> out, have not heard from server in 42003ms for sessionid 0x10003c8af64001d,
>> closing socket connection and attempting reconnect
>> 2016-07-12 11:26:26 INFO  o.a.c.f.s.ConnectionStateManager:228 - State
>> change: SUSPENDED
>> Exception in thread "main"
>> org.apache.zookeeper.KeeperException$ConnectionLossException:
>> KeeperErrorCode = ConnectionLoss for /
>>     at
>> org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
>>     at
>> org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
>>     at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1753)
>>     at
>> org.apache.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:310)
>>     at
>> org.apache.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:299)
>>     at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:108)
>>     at
>> org.apache.curator.framework.imps.GetDataBuilderImpl.pathInForeground(GetDataBuilderImpl.java:295)
>>     at
>> org.apache.curator.framework.imps.GetDataBuilderImpl.forPath(GetDataBuilderImpl.java:287)
>>     at
>> org.apache.curator.framework.imps.GetDataBuilderImpl.forPath(GetDataBuilderImpl.java:34)
>>     at test.Test.main(Test.java:25)
>>
>>
>> That seems to suggest that adding 1 host to check somehow messes up
>> something in the timeouts.
>> I am suspicious of those:
>> 2016-07-12 11:25:44 INFO  o.a.z.ClientCnxn:1297 - Checking server
>> QA-E8WIN13/10.11.8.230:2181 for being r/w. Timeout 3200
>> They seem to be "blocking" the existing connection we have to the healthy
>> ZK server, which goes stale. Is that possible?
>>
>>
>> On Tue, Jul 12, 2016 at 11:17 AM, Benjamin Jaton <bjaton@radiantlogic.com
>> > wrote:
>>
>>> I did not use the zkCli tool but the ZK java API directly. And other
>>> tools like ZooInspector (contrib). They were run from a remote machine.
>>> I ran it on the same machine and the one read only server is running
>>> properly, I can browse it using those methods.
>>>
>>> Trying to make sense of those client-server interactions is difficult
>>> but here is what I got:
>>>
>>> Client:
>>> 2016-07-12 10:55:01,508 INFO  org.apache.zookeeper.ClientCnxn:1138 - *Opening
>>> socket connection to server QA-E8WIN11*/10.11.8.236:2181. Will not
>>> attempt to authenticate using SASL (unknown error)
>>> 2016-07-12 10:55:01,512 INFO  org.apache.zookeeper.ClientCnxn:980 - *Socket
>>> connection established*, initiating session, client: /10.11.12.4:60586,
>>> server: QA-E8WIN11/10.11.8.236:2181
>>> 2016-07-12 10:55:01,521 INFO  org.apache.zookeeper.ClientCnxn:1400 - *Session
>>> establishment complete on server QA-E8WIN11*/10.11.8.236:2181, *sessionid
>>> = 0x10003c8af640007*, negotiated timeout = 45000 (READ-ONLY mode)
>>> 2016-07-12 10:55:01,523 INFO  org.apache.zookeeper.ClientCnxn:1297 -
>>> Checking server QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 200
>>> 2016-07-12 10:55:01,528 INFO
>>>  org.apache.curator.framework.state.ConnectionStateManager:228 - *State
>>> change: READ_ONLY*
>>> 2016-07-12 10:57:08,800 INFO  org.apache.zookeeper.ClientCnxn:1253 - *Unable
>>> to read additional data from server sessionid 0x10003c8af640007, likely
>>> server has closed socket, closing socket connection and attempting
>>> reconnect*
>>> 2016-07-12 10:57:08,903 INFO
>>>  org.apache.curator.framework.state.ConnectionStateManager:228 - *State
>>> change: SUSPENDED*
>>>
>>>
>>> Server:
>>> 2016-07-12T10:55:56,468 [myid:] - INFO  [ProcessThread(sid:1
>>> cport:-1)::ZooKeeperServer@678] - *Established session
>>> 0x10003c8af640007 with negotiated timeout 45000* for client /
>>> 10.11.12.4:60586
>>> (...)
>>> 2016-07-12T10:56:41,756 [myid:] - INFO
>>>  [SessionTracker:ZooKeeperServer@384] - *Expiring session
>>> 0x10003c8af640007, timeout of 45000ms exceeded*
>>>
>>>
>>> Note: Don't worry about the time being about 1 min off between the
>>> machines.
>>>
>>> What I don't understand is why we are losing the read-only connection we
>>> successfully established. ZK ro server says it timed out?
>>>
>>> Now interestingly, when I run it on the same machine it works and
>>> completes pretty quickly:
>>>
>>>
>>> 2016-07-12 10:43:49 INFO  o.a.z.ZooKeeper:716 - Initiating client
>>> connection, connectString=QA-E8WIN11:2181,QA-E8WIN12:2181
>>> sessionTimeout=45000 watcher=org.apache.curator.ConnectionState@e4487af
>>> 2016-07-12 10:43:49 INFO  o.a.z.ClientCnxn:1138 - Opening socket
>>> connection to server QA-E8WIN12/10.11.8.232:2181. Will not attempt to
>>> authenticate using SASL (unknown error)
>>> Successfully established the connection with ZooKeeper
>>> 2016-07-12 10:44:10 WARN  o.a.z.ClientCnxn:1257 - Session 0x0 for server
>>> null, unexpected error, closing socket connection and attempting reconnect
>>> java.net.ConnectException: Connection timed out: no further information
>>> at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[?:1.8.0_91]
>>> at
>>> sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
>>> ~[?:1.8.0_91]
>>> at
>>> org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:355)
>>> ~[zookeeper-3.5.0-alpha.jar:3.5.2-alpha-SNAPSHOT-1702518]
>>> at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1236)
>>> [zookeeper-3.5.0-alpha.jar:3.5.2-alpha-SNAPSHOT-1702518]
>>> 2016-07-12 10:44:11 INFO  o.a.z.ClientCnxn:1138 - Opening socket
>>> connection to server QA-E8WIN11/10.11.8.236:2181. Will not attempt to
>>> authenticate using SASL (unknown error)
>>> 2016-07-12 10:44:11 INFO  o.a.z.ClientCnxn:980 - Socket connection
>>> established, initiating session, client: /10.11.8.236:50147, server:
>>> QA-E8WIN11/10.11.8.236:2181
>>> 2016-07-12 10:44:11 INFO  o.a.z.ClientCnxn:1400 - Session establishment
>>> complete on server QA-E8WIN11/10.11.8.236:2181, sessionid =
>>> 0x10003b315b30012, negotiated timeout = 45000 (READ-ONLY mode)
>>> 2016-07-12 10:44:11 INFO  o.a.z.ClientCnxn:1297 - Checking server
>>> QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 200
>>> 2016-07-12 10:44:11 INFO  o.a.c.f.s.ConnectionStateManager:228 - State
>>> change: READ_ONLY
>>> 2016-07-12 10:44:32 INFO  o.a.z.ClientCnxn:1297 - Checking server
>>> QA-E8WIN11/10.11.8.236:2181 for being r/w. Timeout 400
>>> Done.
>>>
>>>
>>> On Mon, Jul 11, 2016 at 4:42 PM, Cameron McKenzie <
>>> mckenzie.cam@gmail.com> wrote:
>>>
>>>> It looks like a connection issue based on the logs. When you confirmed
>>>> that the connection was ok via the zkCli, was that running on the same host
>>>> as the read only server? Can you run it from the same host that you're
>>>> running the Java client from?
>>>>
>>>> On Tue, Jul 12, 2016 at 9:40 AM, Benjamin Jaton <
>>>> benjamin.jaton@gmail.com> wrote:
>>>>
>>>>> Well I was trying to let it run and it eventually fails, with a stack:
>>>>>
>>>>> Successfully established the connection with ZooKeeper
>>>>> 2016-07-11 16:28:21,943 INFO  org.apache.zookeeper.ClientCnxn:1251 -
>>>>> Client session timed out, have not heard from server in 22519ms for
>>>>> sessionid 0x0, closing socket connection and attempting reconnect
>>>>> 2016-07-11 16:28:22,046 INFO  org.apache.zookeeper.ClientCnxn:1138 -
>>>>> Opening socket connection to server QA-E8WIN11/10.11.8.236:2181. Will
>>>>> not attempt to authenticate using SASL (unknown error)
>>>>> 2016-07-11 16:28:22,050 INFO  org.apache.zookeeper.ClientCnxn:980 -
>>>>> Socket connection established, initiating session, client: /
>>>>> 10.11.12.4:54702, server: QA-E8WIN11/10.11.8.236:2181
>>>>> 2016-07-11 16:28:22,058 INFO  org.apache.zookeeper.ClientCnxn:1400 -
>>>>> Session establishment complete on server QA-E8WIN11/10.11.8.236:2181,
>>>>> sessionid = 0x100024f09360080, negotiated timeout = 45000 (READ-ONLY
mode)
>>>>> 2016-07-11 16:28:22,061 INFO  org.apache.zookeeper.ClientCnxn:1297 -
>>>>> Checking server QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 200
>>>>> 2016-07-11 16:28:22,066 INFO
>>>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>>>> change: READ_ONLY
>>>>> 2016-07-11 16:30:29,312 INFO  org.apache.zookeeper.ClientCnxn:1253 -
>>>>> Unable to read additional data from server sessionid 0x100024f09360080,
>>>>> likely server has closed socket, closing socket connection and attempting
>>>>> reconnect
>>>>> 2016-07-11 16:30:29,416 INFO
>>>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>>>> change: SUSPENDED
>>>>> 2016-07-11 16:30:31,031 INFO  org.apache.zookeeper.ClientCnxn:1138 -
>>>>> Opening socket connection to server QA-E8WIN11/10.11.8.236:2181. Will
>>>>> not attempt to authenticate using SASL (unknown error)
>>>>> 2016-07-11 16:30:31,032 INFO  org.apache.zookeeper.ClientCnxn:980 -
>>>>> Socket connection established, initiating session, client: /
>>>>> 10.11.12.4:55156, server: QA-E8WIN11/10.11.8.236:2181
>>>>> 2016-07-11 16:30:31,034 INFO  org.apache.zookeeper.ClientCnxn:1400 -
>>>>> Session establishment complete on server QA-E8WIN11/10.11.8.236:2181,
>>>>> sessionid = 0x100024f09360083, negotiated timeout = 45000 (READ-ONLY
mode)
>>>>> 2016-07-11 16:30:31,034 INFO  org.apache.zookeeper.ClientCnxn:1297 -
>>>>> Checking server QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 400
>>>>> 2016-07-11 16:30:31,035 INFO
>>>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>>>> change: READ_ONLY
>>>>> 2016-07-11 16:32:38,335 INFO  org.apache.zookeeper.ClientCnxn:1253 -
>>>>> Unable to read additional data from server sessionid 0x100024f09360083,
>>>>> likely server has closed socket, closing socket connection and attempting
>>>>> reconnect
>>>>> 2016-07-11 16:32:38,441 INFO
>>>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>>>> change: SUSPENDED
>>>>> 2016-07-11 16:32:40,425 INFO  org.apache.zookeeper.ClientCnxn:1138 -
>>>>> Opening socket connection to server QA-E8WIN11/10.11.8.236:2181. Will
>>>>> not attempt to authenticate using SASL (unknown error)
>>>>> 2016-07-11 16:32:40,426 INFO  org.apache.zookeeper.ClientCnxn:980 -
>>>>> Socket connection established, initiating session, client: /
>>>>> 10.11.12.4:55637, server: QA-E8WIN11/10.11.8.236:2181
>>>>> 2016-07-11 16:32:40,428 INFO  org.apache.zookeeper.ClientCnxn:1400 -
>>>>> Session establishment complete on server QA-E8WIN11/10.11.8.236:2181,
>>>>> sessionid = 0x100024f09360087, negotiated timeout = 45000 (READ-ONLY
mode)
>>>>> 2016-07-11 16:32:40,428 INFO  org.apache.zookeeper.ClientCnxn:1297 -
>>>>> Checking server QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 800
>>>>> 2016-07-11 16:32:40,428 INFO
>>>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>>>> change: READ_ONLY
>>>>> 2016-07-11 16:34:47,615 INFO  org.apache.zookeeper.ClientCnxn:1253 -
>>>>> Unable to read additional data from server sessionid 0x100024f09360087,
>>>>> likely server has closed socket, closing socket connection and attempting
>>>>> reconnect
>>>>> 2016-07-11 16:34:47,716 INFO
>>>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>>>> change: SUSPENDED
>>>>> 2016-07-11 16:34:49,557 INFO  org.apache.zookeeper.ClientCnxn:1138 -
>>>>> Opening socket connection to server QA-E8WIN11/10.11.8.236:2181. Will
>>>>> not attempt to authenticate using SASL (unknown error)
>>>>> 2016-07-11 16:34:49,558 INFO  org.apache.zookeeper.ClientCnxn:980 -
>>>>> Socket connection established, initiating session, client: /
>>>>> 10.11.12.4:56094, server: QA-E8WIN11/10.11.8.236:2181
>>>>> 2016-07-11 16:34:49,560 INFO  org.apache.zookeeper.ClientCnxn:1400 -
>>>>> Session establishment complete on server QA-E8WIN11/10.11.8.236:2181,
>>>>> sessionid = 0x100024f09360089, negotiated timeout = 45000 (READ-ONLY
mode)
>>>>> 2016-07-11 16:34:49,560 INFO  org.apache.zookeeper.ClientCnxn:1297 -
>>>>> Checking server QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout
>>>>> 1600
>>>>> 2016-07-11 16:34:49,560 INFO
>>>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>>>> change: READ_ONLY
>>>>> 2016-07-11 16:36:56,895 INFO  org.apache.zookeeper.ClientCnxn:1253 -
>>>>> Unable to read additional data from server sessionid 0x100024f09360089,
>>>>> likely server has closed socket, closing socket connection and attempting
>>>>> reconnect
>>>>> Exception in thread "main" 2016-07-11 16:36:56,996 INFO
>>>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>>>> change: SUSPENDED
>>>>> org.apache.zookeeper.KeeperException$ConnectionLossException:
>>>>> KeeperErrorCode = ConnectionLoss for /
>>>>>     at
>>>>> org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
>>>>>     at
>>>>> org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
>>>>>     at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1753)
>>>>>     at
>>>>> org.apache.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:310)
>>>>>     at
>>>>> org.apache.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:299)
>>>>>     at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:108)
>>>>>     at
>>>>> org.apache.curator.framework.imps.GetDataBuilderImpl.pathInForeground(GetDataBuilderImpl.java:295)
>>>>>     at
>>>>> org.apache.curator.framework.imps.GetDataBuilderImpl.forPath(GetDataBuilderImpl.java:287)
>>>>>     at
>>>>> org.apache.curator.framework.imps.GetDataBuilderImpl.forPath(GetDataBuilderImpl.java:34)
>>>>>     at TestCuratorReadOnly.main(TestCuratorReadOnly.java:23)
>>>>>
>>>>> On Mon, Jul 11, 2016 at 4:39 PM, Cameron McKenzie <
>>>>> mckenzie.cam@gmail.com> wrote:
>>>>>
>>>>>> So, it appears that the initial connection occurs ok, but then
>>>>>> something goes wrong
>>>>>>
>>>>>> 2016-07-11 15:49:15,712 INFO  org.apache.zookeeper.ClientCnxn:1253
-
>>>>>> Unable to read additional data from server sessionid 0x100024f0936005b,
>>>>>> likely server has closed socket, closing socket connection and attempting
>>>>>> reconnect
>>>>>>
>>>>>> Then a reconnection occurs ok, and then the cycle starts again.
>>>>>>
>>>>>> Can you see where in the stack the getData() call is hanging?
>>>>>>
>>>>>> On Tue, Jul 12, 2016 at 9:35 AM, Benjamin Jaton <
>>>>>> benjamin.jaton@gmail.com> wrote:
>>>>>>
>>>>>>> The blockUntilConnectedOrTimedOut() does return, we see the line:
>>>>>>> "Successfully established the connection with ZooKeeper"
>>>>>>> which happens right after.
>>>>>>>
>>>>>>> The getData() is where it hangs.
>>>>>>>
>>>>>>> We see this first:
>>>>>>> 2016-07-11 15:47:08,420 INFO
>>>>>>> org.apache.curator.framework.state.ConnectionStateManager:228
- State
>>>>>>> change: READ_ONLY
>>>>>>>
>>>>>>> and then we see it again 2 minutes later:
>>>>>>> 2016-07-11 15:49:17,316 INFO
>>>>>>> org.apache.curator.framework.state.ConnectionStateManager:228
- State
>>>>>>> change: READ_ONLY
>>>>>>>
>>>>>>> and then again 2 minutes after that:
>>>>>>> 2016-07-11 15:51:26,470 INFO
>>>>>>> org.apache.curator.framework.state.ConnectionStateManager:228
- State
>>>>>>> change: READ_ONLY
>>>>>>>
>>>>>>> Then I stopped it.
>>>>>>>
>>>>>>> On Mon, Jul 11, 2016 at 4:13 PM, Cameron McKenzie <
>>>>>>> mckenzie.cam@gmail.com> wrote:
>>>>>>>
>>>>>>>> hey Ben,
>>>>>>>> From the logs it looks like the connection is established
at the
>>>>>>>> end?
>>>>>>>>
>>>>>>>> Are you saying that the blockUntilConnectedOrTimedOut() does
not
>>>>>>>> return when this occurs?
>>>>>>>> cheers
>>>>>>>>
>>>>>>>>
>>>>>>>> On Tue, Jul 12, 2016 at 9:10 AM, Benjamin Jaton <
>>>>>>>> bjaton@radiantlogic.com> wrote:
>>>>>>>>
>>>>>>>>> ZK is 3.5.1-alpha
>>>>>>>>> Curator is 2.11.0
>>>>>>>>>
>>>>>>>>> On Mon, Jul 11, 2016 at 4:01 PM, Benjamin Jaton <
>>>>>>>>> bjaton@radiantlogic.com> wrote:
>>>>>>>>>
>>>>>>>>>> I have a 3 nodes ZK cluster , readonly mode is enabled.
>>>>>>>>>> 2 nodes are down, so the third one is in read-only
(verified by
>>>>>>>>>> using the ZK API manually).
>>>>>>>>>>
>>>>>>>>>> I'm using this piece of code:
>>>>>>>>>>
>>>>>>>>>> Builder curatorClientBuilder = CuratorFrameworkFactory.builder()
>>>>>>>>>> .connectString("QA-E8WIN11:2181,QA-E8WIN12:2181")
>>>>>>>>>> .sessionTimeoutMs(45000).connectionTimeoutMs(15000)
>>>>>>>>>> .retryPolicy(new RetryNTimes(3, 5000)).canBeReadOnly(true);
>>>>>>>>>>
>>>>>>>>>> CuratorFramework client = curatorClientBuilder.build();
>>>>>>>>>> client.start();
>>>>>>>>>> client.getZookeeperClient().blockUntilConnectedOrTimedOut();
>>>>>>>>>> System.out.println("Successfully established the
connection with
>>>>>>>>>> ZooKeeper");
>>>>>>>>>> client.getData().forPath("/");
>>>>>>>>>> System.out.println("Done.");
>>>>>>>>>>
>>>>>>>>>> When curator pick the host that is UP first, it goes
through very
>>>>>>>>>> quickly. When it picks the host that is down first
(QA-E8WIN12), it never
>>>>>>>>>> goes through.
>>>>>>>>>>
>>>>>>>>>> Am I missing something here?
>>>>>>>>>>
>>>>>>>>>> Below is the log:
>>>>>>>>>>
>>>>>>>>>> 2016-07-11 15:46:45,733 INFO
>>>>>>>>>>  org.apache.curator.framework.imps.CuratorFrameworkImpl:235
- Starting
>>>>>>>>>> 2016-07-11 15:46:45,743 INFO  org.apache.zookeeper.ZooKeeper:109
>>>>>>>>>> - Client environment:zookeeper.version=3.5.1-alpha-1748895,
built on
>>>>>>>>>> 06/17/2016 22:24 GMT
>>>>>>>>>> 2016-07-11 15:46:45,743 INFO  org.apache.zookeeper.ZooKeeper:109
>>>>>>>>>> - Client environment:host.name=w-rli09-ben
>>>>>>>>>> 2016-07-11 15:46:45,744 INFO  org.apache.zookeeper.ZooKeeper:109
>>>>>>>>>> - Client environment:java.version=1.8.0_11
>>>>>>>>>> 2016-07-11 15:46:45,744 INFO  org.apache.zookeeper.ZooKeeper:109
>>>>>>>>>> - Client environment:java.vendor=Oracle Corporation
>>>>>>>>>> 2016-07-11 15:46:45,744 INFO  org.apache.zookeeper.ZooKeeper:109
>>>>>>>>>> - Client environment:java.home=/usr/local/apps/jdk1.8.0_11/jre
>>>>>>>>>> 2016-07-11 15:46:45,744 INFO  org.apache.zookeeper.ZooKeeper:109
>>>>>>>>>> - Client environment:java.class.path=(..)
>>>>>>>>>> 2016-07-11 15:46:45,746 INFO  org.apache.zookeeper.ZooKeeper:109
>>>>>>>>>> - Client environment:java.io.tmpdir=/tmp
>>>>>>>>>> 2016-07-11 15:46:45,746 INFO  org.apache.zookeeper.ZooKeeper:109
>>>>>>>>>> - Client environment:java.compiler=<NA>
>>>>>>>>>> 2016-07-11 15:46:45,747 INFO  org.apache.zookeeper.ZooKeeper:109
>>>>>>>>>> - Client environment:os.name=Linux
>>>>>>>>>> 2016-07-11 15:46:45,747 INFO  org.apache.zookeeper.ZooKeeper:109
>>>>>>>>>> - Client environment:os.arch=amd64
>>>>>>>>>> 2016-07-11 15:46:45,747 INFO  org.apache.zookeeper.ZooKeeper:109
>>>>>>>>>> - Client environment:os.version=3.8.0-44-generic
>>>>>>>>>> 2016-07-11 15:46:45,747 INFO  org.apache.zookeeper.ZooKeeper:109
>>>>>>>>>> - Client environment:user.name=benji
>>>>>>>>>> 2016-07-11 15:46:45,747 INFO  org.apache.zookeeper.ZooKeeper:109
>>>>>>>>>> - Client environment:user.home=(..)
>>>>>>>>>> 2016-07-11 15:46:45,747 INFO  org.apache.zookeeper.ZooKeeper:109
>>>>>>>>>> - Client environment:user.dir=(..)
>>>>>>>>>> 2016-07-11 15:46:45,747 INFO  org.apache.zookeeper.ZooKeeper:109
>>>>>>>>>> - Client environment:os.memory.free=385MB
>>>>>>>>>> 2016-07-11 15:46:45,748 INFO  org.apache.zookeeper.ZooKeeper:109
>>>>>>>>>> - Client environment:os.memory.max=5358MB
>>>>>>>>>> 2016-07-11 15:46:45,748 INFO  org.apache.zookeeper.ZooKeeper:109
>>>>>>>>>> - Client environment:os.memory.total=397MB
>>>>>>>>>> 2016-07-11 15:46:45,750 INFO  org.apache.zookeeper.ZooKeeper:716
>>>>>>>>>> - Initiating client connection,
>>>>>>>>>> connectString=QA-E8WIN11:2181,QA-E8WIN12:2181 sessionTimeout=45000
>>>>>>>>>> watcher=org.apache.curator.ConnectionState@3e96bacf
>>>>>>>>>> 2016-07-11 15:46:45,769 INFO
>>>>>>>>>>  org.apache.zookeeper.ClientCnxn:1138 - Opening socket
connection to server
>>>>>>>>>> QA-E8WIN12/10.11.8.232:2181. Will not attempt to
authenticate
>>>>>>>>>> using SASL (unknown error)
>>>>>>>>>> Successfully established the connection with ZooKeeper
>>>>>>>>>> 2016-07-11 15:47:08,300 INFO
>>>>>>>>>>  org.apache.zookeeper.ClientCnxn:1251 - Client session
timed out, have not
>>>>>>>>>> heard from server in 22534ms for sessionid 0x0, closing
socket connection
>>>>>>>>>> and attempting reconnect
>>>>>>>>>> 2016-07-11 15:47:08,403 INFO
>>>>>>>>>>  org.apache.zookeeper.ClientCnxn:1138 - Opening socket
connection to server
>>>>>>>>>> QA-E8WIN11/10.11.8.236:2181. Will not attempt to
authenticate
>>>>>>>>>> using SASL (unknown error)
>>>>>>>>>> 2016-07-11 15:47:08,406 INFO  org.apache.zookeeper.ClientCnxn:980
>>>>>>>>>> - Socket connection established, initiating session,
client: /
>>>>>>>>>> 10.11.12.4:47004, server: QA-E8WIN11/10.11.8.236:2181
>>>>>>>>>> 2016-07-11 15:47:08,413 INFO
>>>>>>>>>>  org.apache.zookeeper.ClientCnxn:1400 - Session establishment
complete on
>>>>>>>>>> server QA-E8WIN11/10.11.8.236:2181, sessionid =
>>>>>>>>>> 0x100024f0936005b, negotiated timeout = 45000 (READ-ONLY
mode)
>>>>>>>>>> 2016-07-11 15:47:08,415 INFO
>>>>>>>>>>  org.apache.zookeeper.ClientCnxn:1297 - Checking
server QA-E8WIN12/
>>>>>>>>>> 10.11.8.232:2181 for being r/w. Timeout 200
>>>>>>>>>> 2016-07-11 15:47:08,420 INFO
>>>>>>>>>>  org.apache.curator.framework.state.ConnectionStateManager:228
- State
>>>>>>>>>> change: READ_ONLY
>>>>>>>>>> 2016-07-11 15:49:15,712 INFO
>>>>>>>>>>  org.apache.zookeeper.ClientCnxn:1253 - Unable to
read additional data from
>>>>>>>>>> server sessionid 0x100024f0936005b, likely server
has closed socket,
>>>>>>>>>> closing socket connection and attempting reconnect
>>>>>>>>>> 2016-07-11 15:49:15,815 INFO
>>>>>>>>>>  org.apache.curator.framework.state.ConnectionStateManager:228
- State
>>>>>>>>>> change: SUSPENDED
>>>>>>>>>> 2016-07-11 15:49:17,313 INFO
>>>>>>>>>>  org.apache.zookeeper.ClientCnxn:1138 - Opening socket
connection to server
>>>>>>>>>> QA-E8WIN11/10.11.8.236:2181. Will not attempt to
authenticate
>>>>>>>>>> using SASL (unknown error)
>>>>>>>>>> 2016-07-11 15:49:17,314 INFO  org.apache.zookeeper.ClientCnxn:980
>>>>>>>>>> - Socket connection established, initiating session,
client: /
>>>>>>>>>> 10.11.12.4:47295, server: QA-E8WIN11/10.11.8.236:2181
>>>>>>>>>> 2016-07-11 15:49:17,316 INFO
>>>>>>>>>>  org.apache.zookeeper.ClientCnxn:1400 - Session establishment
complete on
>>>>>>>>>> server QA-E8WIN11/10.11.8.236:2181, sessionid =
>>>>>>>>>> 0x100024f0936005f, negotiated timeout = 45000 (READ-ONLY
mode)
>>>>>>>>>> 2016-07-11 15:49:17,316 INFO
>>>>>>>>>>  org.apache.zookeeper.ClientCnxn:1297 - Checking
server QA-E8WIN12/
>>>>>>>>>> 10.11.8.232:2181 for being r/w. Timeout 400
>>>>>>>>>> 2016-07-11 15:49:17,316 INFO
>>>>>>>>>>  org.apache.curator.framework.state.ConnectionStateManager:228
- State
>>>>>>>>>> change: READ_ONLY
>>>>>>>>>> 2016-07-11 15:51:24,607 INFO
>>>>>>>>>>  org.apache.zookeeper.ClientCnxn:1253 - Unable to
read additional data from
>>>>>>>>>> server sessionid 0x100024f0936005f, likely server
has closed socket,
>>>>>>>>>> closing socket connection and attempting reconnect
>>>>>>>>>> 2016-07-11 15:51:24,713 INFO
>>>>>>>>>>  org.apache.curator.framework.state.ConnectionStateManager:228
- State
>>>>>>>>>> change: SUSPENDED
>>>>>>>>>> 2016-07-11 15:51:26,467 INFO
>>>>>>>>>>  org.apache.zookeeper.ClientCnxn:1138 - Opening socket
connection to server
>>>>>>>>>> QA-E8WIN11/10.11.8.236:2181. Will not attempt to
authenticate
>>>>>>>>>> using SASL (unknown error)
>>>>>>>>>> 2016-07-11 15:51:26,468 INFO  org.apache.zookeeper.ClientCnxn:980
>>>>>>>>>> - Socket connection established, initiating session,
client: /
>>>>>>>>>> 10.11.12.4:47576, server: QA-E8WIN11/10.11.8.236:2181
>>>>>>>>>> 2016-07-11 15:51:26,470 INFO
>>>>>>>>>>  org.apache.zookeeper.ClientCnxn:1400 - Session establishment
complete on
>>>>>>>>>> server QA-E8WIN11/10.11.8.236:2181, sessionid =
>>>>>>>>>> 0x100024f09360061, negotiated timeout = 45000 (READ-ONLY
mode)
>>>>>>>>>> 2016-07-11 15:51:26,470 INFO
>>>>>>>>>>  org.apache.zookeeper.ClientCnxn:1297 - Checking
server QA-E8WIN12/
>>>>>>>>>> 10.11.8.232:2181 for being r/w. Timeout 800
>>>>>>>>>> 2016-07-11 15:51:26,470 INFO
>>>>>>>>>>  org.apache.curator.framework.state.ConnectionStateManager:228
- State
>>>>>>>>>> change: READ_ONLY
>>>>>>>>>> (...)
>>>>>>>>>>
>>>>>>>>>> Thanks
>>>>>>>>>> Ben
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>

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